CA1150745A - High pressure shaft seal - Google Patents
High pressure shaft sealInfo
- Publication number
- CA1150745A CA1150745A CA000370373A CA370373A CA1150745A CA 1150745 A CA1150745 A CA 1150745A CA 000370373 A CA000370373 A CA 000370373A CA 370373 A CA370373 A CA 370373A CA 1150745 A CA1150745 A CA 1150745A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- wall portion
- housing
- central axis
- support element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3224—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip capable of accommodating changes in distances or misalignment between the surfaces, e.g. able to compensate for defaults of eccentricity or angular deviations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/166—Sealings between relatively-moving surfaces with means to prevent the extrusion of the packing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3216—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction parallel to the surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
- Diaphragms And Bellows (AREA)
- Mechanical Sealing (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
ABSTRACT
There is disclosed a high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, the housing having an opening extending therethrough for receiving the shaft there-in. A rigid case is adapted to be fixed relatively to the housing in a position encircling the shaft, the case having a central axis adapted to be generally coincident with that of the shaft, and comprising an outer annular wall portion adapted to fit within the housing and a front wall portion extending radially inwardly perpendicular to the central axis on a lower pressure side of the seal.
A rigid pressure member is provided, having a central axis adapted to be gener-ally coincident with that of the shaft and comprising an outer annular wall portion adapted to fit within the housing with its front end abutting the front wall portion of the case and a rear wall portion extending radially inwardly perpendicular to the central axis and spaced from the front wall portion of the case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from the shaft. An elastomeric primary sealing member, having a central axis adapted to be generally coincident with that of the shaft comprises an outer annular wall portion fitting within the outer annular wall portion of the rigid case with its front side abutting the rear wall portion of the pressure member and a radially inwardly directed sealing lip for engaging said shaft. An annular floating support element is mounted within the groove for free radial movement therein, the support element having an inner surface for engaging the shaft and an outer surface spaced radially inwardly from the bottom of the annular groove. The floating support element, when fitted, is free to move radially within the groove with the shaft to accommodate any relative eccentricity between the shaft and housing and so prevent extrusion of the primary sealing lip between the shaft and support element.
There is disclosed a high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, the housing having an opening extending therethrough for receiving the shaft there-in. A rigid case is adapted to be fixed relatively to the housing in a position encircling the shaft, the case having a central axis adapted to be generally coincident with that of the shaft, and comprising an outer annular wall portion adapted to fit within the housing and a front wall portion extending radially inwardly perpendicular to the central axis on a lower pressure side of the seal.
A rigid pressure member is provided, having a central axis adapted to be gener-ally coincident with that of the shaft and comprising an outer annular wall portion adapted to fit within the housing with its front end abutting the front wall portion of the case and a rear wall portion extending radially inwardly perpendicular to the central axis and spaced from the front wall portion of the case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from the shaft. An elastomeric primary sealing member, having a central axis adapted to be generally coincident with that of the shaft comprises an outer annular wall portion fitting within the outer annular wall portion of the rigid case with its front side abutting the rear wall portion of the pressure member and a radially inwardly directed sealing lip for engaging said shaft. An annular floating support element is mounted within the groove for free radial movement therein, the support element having an inner surface for engaging the shaft and an outer surface spaced radially inwardly from the bottom of the annular groove. The floating support element, when fitted, is free to move radially within the groove with the shaft to accommodate any relative eccentricity between the shaft and housing and so prevent extrusion of the primary sealing lip between the shaft and support element.
Description
~s~
This invention relates to high pressure shaft seals.
High pressure shaft seals frequently include antiextrusion construc-tions which are intended to prevent extrusion of the primary sealing lip along the shaft when high pressures are present on one side of the seal.
One configuration of such an antiextrusion construction, shown and described in Mastro, United States Patent No, 3,394,939, is deficient in that it completely fails to accommodate the inevitable relative eccentricity between the rotating shaft and the surrounding housing. Although in Andersen et al., United States Patent No, 3,495,843, there is shown and described an antiextru-sion construction intended to accommodate the relative eccentricity between the shaft and housing, its arrangement is such that the degree of its accommodation of such relative eccentricity is insufficient in many installations.
In view of the deficiencies of the prior art, as exemplified by the Mastro and Anderson et al. patents, it is a major object of the present inven-tion to provide a novel high pressure seal having an antiextrusion construction which prevents extrusion of the primary sealing lip while accom~odating a large amount of relative eccentricity between a moving shaft and its housing.
It is another object of the invention to provide a novel high pressure seal of unitary construction for ease of installation.
It is a further object of the invention to provide a novel high pres-sure seal having a wiper for preventing contaminants from migrating along the shaft to the antiextrustion element and the primary sealing lip.
Accordingly, the present invention provides a novel high pressure shaft seal for use between a moving shaft and a surrounding stationary housing.
In general, it comprises a high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, the housing having an opening extending therethrough for receiving O~S
the shaft therein, comprising: a rigid case adapted to be fixed relatively to the housing in a position encircling the shaft, the rigid case having a central axis adapted to be generally coincident with that of the shaft and comprising an outer annular wall portion adapted to fit within the housing and a front wall portion extending radially inwardly perpendicular to the central axis on a lower pressure side of the seal, a rigid pressure member having a central axis adapted to be generally coincident with that of the shaft and comprising an outer annular wall portion adapted to fit within the housing with its front end abutting the front wall portion of the case and a rear wall portion extending radially inwardly perpendicular to the central axis and spaced from the front wall portion of the case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from the shaft, an elastomeric primary sealing member, having a central axis adapted to be generally coincident with that of the shaft, and comprising an outer annular wall portion fitting within the outer annular wall portion of the rigid case with its front side abutting the rear wall portion of the pressure member and a radially inwardly directed sealing lip for engaging the shaft, and an annular floating support elenlent mounted within the groove for free radial movement therein, the support element having an inner surface for engaging the shaft and an outer surface spaced radially inwardly from the bottom of the annular groove. The ~loating support element, when fitted, is free to move radially within the groove with the shaft to accommodate any relative eccentricity between the shaft and housing and so prevent extrusion of the primary sealing lip between the shaft and support element.
More specifically, the rigid case is preferably made of metal. The rigid pressure member is also preferably of metal.
~l:15~7~
The elastomeric primary sealing member preferably has an annular spring retaining groove located radially outwardly of its sealing lip with a continuous coil spring mounted therein~ proYiding an inwardly directed force for biasing the sealing lip into contact with the shaft.
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In preferred embodiments, the rear side of the sealing member may be frusto-conical, flaring toward the high pressure side of the sealing member; and the floating support element may also have a generally frusto-conical outer sur-face cooperating ~ith the like surface on the sealing member.
In further preferred embodiments, the rigid case may have an elasto-meric material molded onto its outer annular wall portion to facilitate its fit and retention within the surrounding stationary housing, as well as to provide a seal within the stationary housing, and its front wall portion may be provided with a wiper lip engaging ~he shaft on the lower pressure side of the seal to prevent contaminants from migrating along the shaft to the -floating support ele-ment and t~e sealing memfier.
Other ob~ects, features, and advantages o$ the present invention will appear from the following detailed description of a pre~erred embodiment thereof, taken together with the accompanying drawings, wherein:
Figure 1 is an exploded view of the components of the high pressure shaft seal according to the present invention;
Pigure 2 is a fragmentary radial sectional view of the shaft seal shown in Figure l;
Figure 3 is a fragmentary radial sectional view of the shaft seal 2Q shown in Figures 1 and 2 in its operating condition; and ~igure 4 is an explanatory view of the elastomeric primary sealing memfier in ~oth non-operating and operating conditions.
Referring to the drawings, the present invention provides a novel unitary high pressure shaft seal, generally designated 16, for use between a rotating or reciprocating shaft 12 and a surroundlng stationary housing 14, both haying a common central axis 13.
In general, it comprises a rigid case, generally designated 18, ~ .
~IL5~ 5 adapted to ~e fixed relatively to housing 14 in a position encircling shaft 12;
a rigid pressure mem~er, generally designated 26, fitting within case 18 and co-operating with it to provide an inwardly open annular groove 34 surrounding shaft 12; an elastomeric sealing member, generally designated 36, also mounted within case 18; and an annular floating support element, generally designated 50, mounted within groove 34 for ree radial movement therein to accommodate any relative eccentricity between shaft 12 and housing 14 and so prevent extrusion of elastomeric sealing member 36 along shaft 12 in the direction shown by the arro~ P in Figure 3.
lQ More specifically, rigid case 18 is pre~erably of me~al and has its central axis 13 coincident with that of shaft 12. It has an outer annular wall portion 20 haivng an outer cylindrical surface 19 adapted to fit within housing 14 and an inner cylindrical surface 21. It also has a front wall portion 22, having an inner wall surface 23, extending radially inwardly perpendicular to central axis 13 toward shaft 12 on the lower pressure side 24 of seal 16.
Pressure member 26 is also preferal~ly of metal and has its central axis 13 generally coincident with that of shaft 12. It has an outer annular wall portion 28 having an inner cylindrical surface 35 and an outer cylindrical sur-face 27 ~P~gure 4) spaced radially inwardly o inner surface 21 of case 18 with 2Q its front end surface 30 abutting the front wall surface 23 of case 18 and a rear wall portion 32 extending radially inwardly perpendicular to central axis 13 toward shaft 12 and spaced from the front wall portion 22 of case 18 to form therebetween an inwardly open annular groove 34 surrounding shaft 12. Rear wall portion 32 has its annular inner surface 33 ~Figure 4) spaced radially outwardly from shaft 12.
ElaStomeric primary sealing member 36 also has its central axis 13 coincident with that of shaft 12. It has an outer annular wall portion 38 fit-. .
S
ting within outer annular ~all portion 20 of rig~d case 18 and a radially in-wardly directed sealing lip 42 for engaging s-haft 12. Preferably, sealing member 36 is adhesively attac~ed to pressure member 26 to form a unit therewith for ease of assembly with tKe outer front portion 43 of outer wall portion 38 sur-rounding t~e outer annular wall portion 28 of pressure member 26; with the front side 40 abuttIng the rear wall portion 32 of pressure member 26; and with the inner front portion 44 attached to the annular inner sur$ace 33 of pressure mem-ber 26.
The outer wall portion 38 of sealing member 36 1S generally frusto-conical, flaring ou~wardly toward the high pressure side o$ seal 16J as indicated by the arrow P in Figure 3. It has an outer surface 39 that is spaced inwardly from the inner surface 21 of case 18 at the outer front portion 43 but abuts in-ner surface 21 with an lnterference fit adjacent the high pressure side P. Be-cause of such frusto-conical shape, whereby the diameter of the outer wall por-tlon 38 of sealing member 36 is smaller toward the lower pressure side 24 than toward the high pressure side P, illustrated in its non-assembled position in Pigure 4, sealing member 36 fits easily into rigid case 18 during assembly of shaft seal 16.
Primary sealing member 36 also has an annular spring retaining groove 2Q 47 located radially outwardly of its sealing lip 42 with a continuous coil spring 46 mounted t~ereln, providing an inwardly directed force biasing sealing llp 42 into contact with shaft 12.
Annular groove 34 has a lower pressure $ide axial surface 23 on the front wall portion 22 of case 18; a cylindrical inner surface 35 on the outer annular wall portion 28 of pressure member 26 and spaced radially outwardly from shaft 12; a hlgh pressure side axial surface 45 on both the rear wall portion 32 of pressure member 26 and the inner front portion 44 of sealing member 36; and a J
7~5 frusto-conical inner side sur$ace 48 on the lnner front portion 44 of sealing member 36.
Particularly in accordance with the present invention, a no~el annular floating support element 50, of rigid metal or plastic material, is mounted with-in groove 34 for free radial movement therein. Support element 50 has an inner surface 52 for engaging shaft 12; a lower pressure side axial surface 51 spaced axially from the lower pressure side axial surface 23 of annular groove 34; a cylindrical outer surface 53 of smaller diameter than that of the cylindrical inner surface of annular groove 34 so that it is spaced radially inwardly there-from; a high pressure side axial surface 55 spaced axially~from the high pressure side axial surface 45 o~ annular groove 34; and a generally frusto-conical outer side surface 54 spaced radially inwardly from th0 frusto-conical inner side sur-face 48 of annular groove 34. Cylindrical inner surface 35 is radially spaced from its counterpart cylindrical outer sur~ace 53, t~hen assem~led, as are axial surfaces 23, 51, 45, 55 and also frusto-conical surfaces 48 and 54, thus allowing radial movement of support element 50 in order to accommodate any relative ec-centricity ~etween shaft 12 and housing 14, in order to prevent extrusion of the elastomeric sealing member 36 along shaft 12.
Rigid case 18 also has an elastomeric matèrial 56 molded onto its 2Q outer annular wall portion surface 19 adapted to be received within surrounding stationary housing 14. The elastomeric material 56 compensates for imperfect dimensions, such as shaft seal 16 having an outer diameter smaller than manufac-turing specifications or housing 14 having an inner diameter greater than speci-fications, ~y providing a unitary shaft seal 16 having an outer diameter which i~ always greater than the inner diameter of housing 14. Consequently, shaft seal 16 will fit properly with an intererence f;t within housing 14 so that it w~ e retained thereby, regardless of imperfect dimensions.
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, . .
:
.`, ` ~ .
~:~L5~7~5 ElastomerIc material 56 also includes a ~iper lip 58 that engages shaft 12 on the lower pressure side 24 of seal 16 for preventing contaminants from migrating along shaft 12 to sealing member 36 and floating support element 5~.
During assembly of shaft seal 16 into a unit, as best shown in Figure 1, annular ~loating support element 50 is placed in rigid case 18 with its side surface 51 adjacent surface 23 of case 18. The unitary elastomeric primar~ seal-ing mem~er 36 and rigid pressure member 26 are ~itted next into rigid case 18.
The front end sur$ace 3~ of pressure member 26 abuts the front wall portion 22 of rigid case 18, and the outer annular wall portion 38 o~ sealing member 36 abuts the outer annular wall portion 20 of rigid case 18 ~ith an interEerence fit. The frusto-conical shape of this unitary body makes it easier to fit it into rigid case 18. The continuous coil spring 46 is mounted last into the annular spring ~retaining groove 47 of sealing member 36.
During installation of unitary shaft seal 16 within housing 14, rigid case 18 is oriented with wiper lip 58 toward the direction that will be the lower pressure side 24 Nhen shaft seal 16 is mounted on shaft 12.
In operation, elastomeric sealing lip 42 and wiper lip 54 move radial-ly outwardly~with respect to their central axes 13, from their non-operative condition, as shown in Figure 2, to an operative condition as shaf~ seal 16 is mounted on shaft 12, as shown in Figure 3. The radially outward movement of seal-i~ng.l~p 42~i~s diagramatically shown in Figure 4, in which the solid line repre-sents sealing lip 42 in its non-operative condition and the dotted lines repre-sent it in its operative condition.
THe continuous coil s~pring 46 provides a radially inwardly directed force that biases sealing lip 42 into contact with shaft 12 and thereby prevents t~e escape o~ the liquid from the high pressure side P along shaft 12. When ~_ - 7 -:
~so~
sha~t 12 is rotati~ng or reciprocating, annular ~loating support element 50 pre-vents the pressure extrusIon of the elastomeric sealing member 36 toward the lower press~ure side 24 by pressure P. In addition, support element 50 moves radially with~n annular groove 34 to accommodate any relative eccentricity be-tween rotating shaft 12 and housing 14 while preventing pressure extrusion of sealing mem~er 36 along shaft 12.
~ iper lip 58, which engages shaft 12 at the lower pressure side 24 of seal 16, prevents contaminants from migrating into support element 50 and sealing member 36.
. . - 8 -
This invention relates to high pressure shaft seals.
High pressure shaft seals frequently include antiextrusion construc-tions which are intended to prevent extrusion of the primary sealing lip along the shaft when high pressures are present on one side of the seal.
One configuration of such an antiextrusion construction, shown and described in Mastro, United States Patent No, 3,394,939, is deficient in that it completely fails to accommodate the inevitable relative eccentricity between the rotating shaft and the surrounding housing. Although in Andersen et al., United States Patent No, 3,495,843, there is shown and described an antiextru-sion construction intended to accommodate the relative eccentricity between the shaft and housing, its arrangement is such that the degree of its accommodation of such relative eccentricity is insufficient in many installations.
In view of the deficiencies of the prior art, as exemplified by the Mastro and Anderson et al. patents, it is a major object of the present inven-tion to provide a novel high pressure seal having an antiextrusion construction which prevents extrusion of the primary sealing lip while accom~odating a large amount of relative eccentricity between a moving shaft and its housing.
It is another object of the invention to provide a novel high pressure seal of unitary construction for ease of installation.
It is a further object of the invention to provide a novel high pres-sure seal having a wiper for preventing contaminants from migrating along the shaft to the antiextrustion element and the primary sealing lip.
Accordingly, the present invention provides a novel high pressure shaft seal for use between a moving shaft and a surrounding stationary housing.
In general, it comprises a high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, the housing having an opening extending therethrough for receiving O~S
the shaft therein, comprising: a rigid case adapted to be fixed relatively to the housing in a position encircling the shaft, the rigid case having a central axis adapted to be generally coincident with that of the shaft and comprising an outer annular wall portion adapted to fit within the housing and a front wall portion extending radially inwardly perpendicular to the central axis on a lower pressure side of the seal, a rigid pressure member having a central axis adapted to be generally coincident with that of the shaft and comprising an outer annular wall portion adapted to fit within the housing with its front end abutting the front wall portion of the case and a rear wall portion extending radially inwardly perpendicular to the central axis and spaced from the front wall portion of the case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from the shaft, an elastomeric primary sealing member, having a central axis adapted to be generally coincident with that of the shaft, and comprising an outer annular wall portion fitting within the outer annular wall portion of the rigid case with its front side abutting the rear wall portion of the pressure member and a radially inwardly directed sealing lip for engaging the shaft, and an annular floating support elenlent mounted within the groove for free radial movement therein, the support element having an inner surface for engaging the shaft and an outer surface spaced radially inwardly from the bottom of the annular groove. The ~loating support element, when fitted, is free to move radially within the groove with the shaft to accommodate any relative eccentricity between the shaft and housing and so prevent extrusion of the primary sealing lip between the shaft and support element.
More specifically, the rigid case is preferably made of metal. The rigid pressure member is also preferably of metal.
~l:15~7~
The elastomeric primary sealing member preferably has an annular spring retaining groove located radially outwardly of its sealing lip with a continuous coil spring mounted therein~ proYiding an inwardly directed force for biasing the sealing lip into contact with the shaft.
2a~
~15~
In preferred embodiments, the rear side of the sealing member may be frusto-conical, flaring toward the high pressure side of the sealing member; and the floating support element may also have a generally frusto-conical outer sur-face cooperating ~ith the like surface on the sealing member.
In further preferred embodiments, the rigid case may have an elasto-meric material molded onto its outer annular wall portion to facilitate its fit and retention within the surrounding stationary housing, as well as to provide a seal within the stationary housing, and its front wall portion may be provided with a wiper lip engaging ~he shaft on the lower pressure side of the seal to prevent contaminants from migrating along the shaft to the -floating support ele-ment and t~e sealing memfier.
Other ob~ects, features, and advantages o$ the present invention will appear from the following detailed description of a pre~erred embodiment thereof, taken together with the accompanying drawings, wherein:
Figure 1 is an exploded view of the components of the high pressure shaft seal according to the present invention;
Pigure 2 is a fragmentary radial sectional view of the shaft seal shown in Figure l;
Figure 3 is a fragmentary radial sectional view of the shaft seal 2Q shown in Figures 1 and 2 in its operating condition; and ~igure 4 is an explanatory view of the elastomeric primary sealing memfier in ~oth non-operating and operating conditions.
Referring to the drawings, the present invention provides a novel unitary high pressure shaft seal, generally designated 16, for use between a rotating or reciprocating shaft 12 and a surroundlng stationary housing 14, both haying a common central axis 13.
In general, it comprises a rigid case, generally designated 18, ~ .
~IL5~ 5 adapted to ~e fixed relatively to housing 14 in a position encircling shaft 12;
a rigid pressure mem~er, generally designated 26, fitting within case 18 and co-operating with it to provide an inwardly open annular groove 34 surrounding shaft 12; an elastomeric sealing member, generally designated 36, also mounted within case 18; and an annular floating support element, generally designated 50, mounted within groove 34 for ree radial movement therein to accommodate any relative eccentricity between shaft 12 and housing 14 and so prevent extrusion of elastomeric sealing member 36 along shaft 12 in the direction shown by the arro~ P in Figure 3.
lQ More specifically, rigid case 18 is pre~erably of me~al and has its central axis 13 coincident with that of shaft 12. It has an outer annular wall portion 20 haivng an outer cylindrical surface 19 adapted to fit within housing 14 and an inner cylindrical surface 21. It also has a front wall portion 22, having an inner wall surface 23, extending radially inwardly perpendicular to central axis 13 toward shaft 12 on the lower pressure side 24 of seal 16.
Pressure member 26 is also preferal~ly of metal and has its central axis 13 generally coincident with that of shaft 12. It has an outer annular wall portion 28 having an inner cylindrical surface 35 and an outer cylindrical sur-face 27 ~P~gure 4) spaced radially inwardly o inner surface 21 of case 18 with 2Q its front end surface 30 abutting the front wall surface 23 of case 18 and a rear wall portion 32 extending radially inwardly perpendicular to central axis 13 toward shaft 12 and spaced from the front wall portion 22 of case 18 to form therebetween an inwardly open annular groove 34 surrounding shaft 12. Rear wall portion 32 has its annular inner surface 33 ~Figure 4) spaced radially outwardly from shaft 12.
ElaStomeric primary sealing member 36 also has its central axis 13 coincident with that of shaft 12. It has an outer annular wall portion 38 fit-. .
S
ting within outer annular ~all portion 20 of rig~d case 18 and a radially in-wardly directed sealing lip 42 for engaging s-haft 12. Preferably, sealing member 36 is adhesively attac~ed to pressure member 26 to form a unit therewith for ease of assembly with tKe outer front portion 43 of outer wall portion 38 sur-rounding t~e outer annular wall portion 28 of pressure member 26; with the front side 40 abuttIng the rear wall portion 32 of pressure member 26; and with the inner front portion 44 attached to the annular inner sur$ace 33 of pressure mem-ber 26.
The outer wall portion 38 of sealing member 36 1S generally frusto-conical, flaring ou~wardly toward the high pressure side o$ seal 16J as indicated by the arrow P in Figure 3. It has an outer surface 39 that is spaced inwardly from the inner surface 21 of case 18 at the outer front portion 43 but abuts in-ner surface 21 with an lnterference fit adjacent the high pressure side P. Be-cause of such frusto-conical shape, whereby the diameter of the outer wall por-tlon 38 of sealing member 36 is smaller toward the lower pressure side 24 than toward the high pressure side P, illustrated in its non-assembled position in Pigure 4, sealing member 36 fits easily into rigid case 18 during assembly of shaft seal 16.
Primary sealing member 36 also has an annular spring retaining groove 2Q 47 located radially outwardly of its sealing lip 42 with a continuous coil spring 46 mounted t~ereln, providing an inwardly directed force biasing sealing llp 42 into contact with shaft 12.
Annular groove 34 has a lower pressure $ide axial surface 23 on the front wall portion 22 of case 18; a cylindrical inner surface 35 on the outer annular wall portion 28 of pressure member 26 and spaced radially outwardly from shaft 12; a hlgh pressure side axial surface 45 on both the rear wall portion 32 of pressure member 26 and the inner front portion 44 of sealing member 36; and a J
7~5 frusto-conical inner side sur$ace 48 on the lnner front portion 44 of sealing member 36.
Particularly in accordance with the present invention, a no~el annular floating support element 50, of rigid metal or plastic material, is mounted with-in groove 34 for free radial movement therein. Support element 50 has an inner surface 52 for engaging shaft 12; a lower pressure side axial surface 51 spaced axially from the lower pressure side axial surface 23 of annular groove 34; a cylindrical outer surface 53 of smaller diameter than that of the cylindrical inner surface of annular groove 34 so that it is spaced radially inwardly there-from; a high pressure side axial surface 55 spaced axially~from the high pressure side axial surface 45 o~ annular groove 34; and a generally frusto-conical outer side surface 54 spaced radially inwardly from th0 frusto-conical inner side sur-face 48 of annular groove 34. Cylindrical inner surface 35 is radially spaced from its counterpart cylindrical outer sur~ace 53, t~hen assem~led, as are axial surfaces 23, 51, 45, 55 and also frusto-conical surfaces 48 and 54, thus allowing radial movement of support element 50 in order to accommodate any relative ec-centricity ~etween shaft 12 and housing 14, in order to prevent extrusion of the elastomeric sealing member 36 along shaft 12.
Rigid case 18 also has an elastomeric matèrial 56 molded onto its 2Q outer annular wall portion surface 19 adapted to be received within surrounding stationary housing 14. The elastomeric material 56 compensates for imperfect dimensions, such as shaft seal 16 having an outer diameter smaller than manufac-turing specifications or housing 14 having an inner diameter greater than speci-fications, ~y providing a unitary shaft seal 16 having an outer diameter which i~ always greater than the inner diameter of housing 14. Consequently, shaft seal 16 will fit properly with an intererence f;t within housing 14 so that it w~ e retained thereby, regardless of imperfect dimensions.
. .
, . .
:
.`, ` ~ .
~:~L5~7~5 ElastomerIc material 56 also includes a ~iper lip 58 that engages shaft 12 on the lower pressure side 24 of seal 16 for preventing contaminants from migrating along shaft 12 to sealing member 36 and floating support element 5~.
During assembly of shaft seal 16 into a unit, as best shown in Figure 1, annular ~loating support element 50 is placed in rigid case 18 with its side surface 51 adjacent surface 23 of case 18. The unitary elastomeric primar~ seal-ing mem~er 36 and rigid pressure member 26 are ~itted next into rigid case 18.
The front end sur$ace 3~ of pressure member 26 abuts the front wall portion 22 of rigid case 18, and the outer annular wall portion 38 o~ sealing member 36 abuts the outer annular wall portion 20 of rigid case 18 ~ith an interEerence fit. The frusto-conical shape of this unitary body makes it easier to fit it into rigid case 18. The continuous coil spring 46 is mounted last into the annular spring ~retaining groove 47 of sealing member 36.
During installation of unitary shaft seal 16 within housing 14, rigid case 18 is oriented with wiper lip 58 toward the direction that will be the lower pressure side 24 Nhen shaft seal 16 is mounted on shaft 12.
In operation, elastomeric sealing lip 42 and wiper lip 54 move radial-ly outwardly~with respect to their central axes 13, from their non-operative condition, as shown in Figure 2, to an operative condition as shaf~ seal 16 is mounted on shaft 12, as shown in Figure 3. The radially outward movement of seal-i~ng.l~p 42~i~s diagramatically shown in Figure 4, in which the solid line repre-sents sealing lip 42 in its non-operative condition and the dotted lines repre-sent it in its operative condition.
THe continuous coil s~pring 46 provides a radially inwardly directed force that biases sealing lip 42 into contact with shaft 12 and thereby prevents t~e escape o~ the liquid from the high pressure side P along shaft 12. When ~_ - 7 -:
~so~
sha~t 12 is rotati~ng or reciprocating, annular ~loating support element 50 pre-vents the pressure extrusIon of the elastomeric sealing member 36 toward the lower press~ure side 24 by pressure P. In addition, support element 50 moves radially with~n annular groove 34 to accommodate any relative eccentricity be-tween rotating shaft 12 and housing 14 while preventing pressure extrusion of sealing mem~er 36 along shaft 12.
~ iper lip 58, which engages shaft 12 at the lower pressure side 24 of seal 16, prevents contaminants from migrating into support element 50 and sealing member 36.
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Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, said housing having an opening extending therethrough for receiving said shaft therein, comprising:
a rigid case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, a rigid pressure member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member, having a central axis adapted to be generally coincident with that of said shaft, and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, and an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and an outer surface spaced radially inwardly from the bottom of said annular groove, whereby said floating support element, when fitted, is free to move radially within said groove with said shaft to accommodate any relative `
eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element.
a rigid case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, a rigid pressure member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member, having a central axis adapted to be generally coincident with that of said shaft, and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, and an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and an outer surface spaced radially inwardly from the bottom of said annular groove, whereby said floating support element, when fitted, is free to move radially within said groove with said shaft to accommodate any relative `
eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element.
2. A high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, said housing having an opening extending therethrough for receiving said shaft therein, comprising:
a rigid case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, a rigid pressure member, having a central axis adapted to be generally coincident with that of said shaft, and comprising an outer annular wall portion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, said bottom of said annular groove being a generally frusto-conical inner surface formed from said rear wall portion of said pressure member and said front side of said sealing member, and an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and a generally frusto-conical outer surface spaced radially inwardly from said frusto-conical inner surface of said annular groove, whereby said floating support element when fitted is free to move radially within said groove with said shaft to accommodate any relative eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element.
a rigid case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, a rigid pressure member, having a central axis adapted to be generally coincident with that of said shaft, and comprising an outer annular wall portion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, said bottom of said annular groove being a generally frusto-conical inner surface formed from said rear wall portion of said pressure member and said front side of said sealing member, and an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and a generally frusto-conical outer surface spaced radially inwardly from said frusto-conical inner surface of said annular groove, whereby said floating support element when fitted is free to move radially within said groove with said shaft to accommodate any relative eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element.
3. A high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, said housing having an opening extending therethrough for receiving said shaft therein, comprising:
a rigid case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, a rigid pressure member, having a central axis adapted to be generally coincident with that of said shaft, and comprising an outer annular wall por-tion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, said sealing member being generally frusto-conical with its said front side being of smaller diameter and flaring toward the back side of said sealing member, and an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and an outer surface spaced radially inwardly from the bottom of said annular groove, whereby said floating support element when fitted is free to move radially within said groove with said shaft to accommodate any relative eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element.
a rigid case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, a rigid pressure member, having a central axis adapted to be generally coincident with that of said shaft, and comprising an outer annular wall por-tion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, said sealing member being generally frusto-conical with its said front side being of smaller diameter and flaring toward the back side of said sealing member, and an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and an outer surface spaced radially inwardly from the bottom of said annular groove, whereby said floating support element when fitted is free to move radially within said groove with said shaft to accommodate any relative eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element.
4. The high pressure shaft seal of claim 1, 2 or 3 wherein said rigid case and said rigid pressure member are of metallic material.
5. The high pressure shaft seal of claim 1, 2 or 3 wherein said rigid case has an elastomeric material molded onto said outer annular wall portion and said front wall portion with a wiper lip for engaging said shaft on said lower pressure side of said seal to prevent contaminants from migrating into said sealing member and said floating support element.
. 6. The high pressure shaft seal of claim 1, 2 or 3 wherein said primary sealing member has an annular spring retaining groove located radially outwardly of said sealing lip, and a continuous coil spring is mounted in said annular spring retaining groove providing a radially inwardly directed force for biasing said sealing lip into radially inward contact with said shaft.
7. A high pressure shaft seal for use between a shaft and a surrounding housing, the shaft and housing being relatively rotatable, said housing having an opening extending therethrough for receiving said shaft therein, comprising:
a rigid metallic case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, said rigid case having an elastomeric material molded onto said outer annular wall portion and said front wall portion with a wiper lip for engaging said shaft on said lower pressure side of said seal, a rigid metallic pressure member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, said sealing member being generally frusto-conical with its said front side being of smaller diameter and flaring toward the back side of said sealing member, said primary sealing member having an annular spring retaining groove located radially outwardly of said sealing lip, and a continuous coil spring mounted in said annular spring retaining groove providing a radially inwardly directed force for biasing said sealing lip into radially inward contact with said shaft, a portion of said bottom of said annular groove being a generally frusto-conical inner surface formed from said rear wall portion of said pressure member and said front side of said sealing member, an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and including a generally frusto-conical outer surface spaced radially inwardly from said frusto-conical inner surface of said annular groove, whereby said floating support element when fitted is free to move radially within said groove with said shaft to accommodate any relative eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element, said elastomeric material molded onto said outer annular wall portion of said rigid case being adapted to be received within said surrounding station-ary housing, and said front wall portion wiper lip being adapted to engage said shaft on said lower pressure side of said seal to prevent contaminants from migrating into said sealing member and said floating support element.
a rigid metallic case adapted to be fixed relatively to said housing in a position encircling said shaft, said rigid case having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing and a front wall portion extending radially inwardly perpendicular to said central axis on a lower pressure side of said seal, said rigid case having an elastomeric material molded onto said outer annular wall portion and said front wall portion with a wiper lip for engaging said shaft on said lower pressure side of said seal, a rigid metallic pressure member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion adapted to fit within said housing with its front end abutting said front wall portion of said case and a rear wall portion extending radially inwardly perpendicular to said central axis and spaced from said front wall portion of said case to form therebetween an inwardly open annular groove having its bottom spaced radially outwardly from said shaft, an elastomeric primary sealing member having a central axis adapted to be generally coincident with that of said shaft and comprising an outer annular wall portion fitting within said outer annular wall portion of said rigid case with its front side abutting said rear wall portion of said pressure member and a radially inwardly directed sealing lip for engaging said shaft, said sealing member being generally frusto-conical with its said front side being of smaller diameter and flaring toward the back side of said sealing member, said primary sealing member having an annular spring retaining groove located radially outwardly of said sealing lip, and a continuous coil spring mounted in said annular spring retaining groove providing a radially inwardly directed force for biasing said sealing lip into radially inward contact with said shaft, a portion of said bottom of said annular groove being a generally frusto-conical inner surface formed from said rear wall portion of said pressure member and said front side of said sealing member, an annular floating support element mounted within said groove for free radial movement therein, said support element having an inner surface for engaging said shaft and including a generally frusto-conical outer surface spaced radially inwardly from said frusto-conical inner surface of said annular groove, whereby said floating support element when fitted is free to move radially within said groove with said shaft to accommodate any relative eccentricity between said shaft and said housing and so prevent extrusion of said primary sealing lip between said shaft and said support element, said elastomeric material molded onto said outer annular wall portion of said rigid case being adapted to be received within said surrounding station-ary housing, and said front wall portion wiper lip being adapted to engage said shaft on said lower pressure side of said seal to prevent contaminants from migrating into said sealing member and said floating support element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US119,631 | 1980-02-07 | ||
| US06/119,631 US4300778A (en) | 1980-02-07 | 1980-02-07 | High pressure shaft seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1150745A true CA1150745A (en) | 1983-07-26 |
Family
ID=22385437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000370373A Expired CA1150745A (en) | 1980-02-07 | 1981-02-06 | High pressure shaft seal |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4300778A (en) |
| EP (1) | EP0033964B1 (en) |
| JP (1) | JPS56150671A (en) |
| AT (1) | ATE2570T1 (en) |
| BR (1) | BR8100747A (en) |
| CA (1) | CA1150745A (en) |
| DE (1) | DE3160066D1 (en) |
| MX (1) | MX152400A (en) |
Families Citing this family (41)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5913753U (en) * | 1982-07-20 | 1984-01-27 | キ−パ−株式会社 | Oil seal with backup spring |
| US4491332A (en) * | 1983-11-07 | 1985-01-01 | Eaton Corporation | Shaft seal and means to effect radial movement of sealing lip |
| KR890004033B1 (en) * | 1985-04-16 | 1989-10-16 | 에누오우케이 가부시끼가이샤 | Radial oil sealing |
| US4586718A (en) * | 1985-09-06 | 1986-05-06 | Crane Co. | Sealing assembly with floating gland means for rotatable shafts |
| DE3545683C1 (en) * | 1985-12-21 | 1987-07-16 | Freudenberg Carl Fa | Shaft seal |
| US4747605A (en) * | 1986-05-30 | 1988-05-31 | Dana Corporation | Fluid pressure seal with pressure distortion barrier |
| JPH0448366Y2 (en) * | 1987-07-31 | 1992-11-13 | ||
| JPH079730Y2 (en) * | 1987-12-04 | 1995-03-08 | トヨタ自動車株式会社 | Steering device |
| US5456475A (en) * | 1988-04-28 | 1995-10-10 | Skf Usa Inc. | Protected seal assembly and protective filter unit therefor |
| US5385351A (en) * | 1988-07-11 | 1995-01-31 | White Hydraulics, Inc. | Removable shaft seal |
| US5213343A (en) * | 1988-07-11 | 1993-05-25 | White Hydraulics, Inc. | Shaft seal with support member and backing ring |
| DE4205862C1 (en) * | 1992-02-26 | 1993-06-17 | Fa. Carl Freudenberg, 6940 Weinheim, De | |
| EP0563439B1 (en) * | 1992-03-31 | 1996-01-03 | Firma Carl Freudenberg | Sealing for a reciprocating rod |
| JP3407436B2 (en) * | 1994-10-28 | 2003-05-19 | エヌオーケー株式会社 | Sealing device |
| DE19525054C2 (en) * | 1995-07-10 | 1999-02-25 | Freudenberg Carl Fa | Process for producing a radial shaft seal |
| AU2051497A (en) * | 1996-02-23 | 1997-09-10 | John Crane Inc. | Improved radial lip shaft seal |
| US5975538A (en) * | 1997-06-19 | 1999-11-02 | John Crane Inc. | Radial lip shaft seal |
| EP1055849B1 (en) * | 1999-05-22 | 2004-11-17 | Carl Freudenberg KG | Sealing assembly for pressurized enclosures |
| JP2001263499A (en) * | 2000-03-17 | 2001-09-26 | Eagle Ind Co Ltd | Lip type seal |
| US6322082B1 (en) | 2000-03-20 | 2001-11-27 | Skf Usa Inc. | High pressure seal with contoured stamping I. D. |
| US7025357B2 (en) * | 2001-06-08 | 2006-04-11 | Freudenberg-Nok General Partnership | Shaft seal having lip supports |
| JP2005090569A (en) * | 2003-09-16 | 2005-04-07 | Nok Corp | Sealing device for reciprocating shaft |
| DE10346419A1 (en) * | 2003-10-07 | 2005-05-19 | Kaco Gmbh + Co. Kg | Radial shaft seal |
| JP4639619B2 (en) * | 2004-03-23 | 2011-02-23 | Ｎｏｋ株式会社 | Sealing device for reciprocating shaft |
| US7854433B2 (en) * | 2005-02-24 | 2010-12-21 | Freudenberg-Nok General Partnership | Dynamic seal |
| JP5045870B2 (en) * | 2005-12-08 | 2012-10-10 | Ｎｏｋ株式会社 | Sealing device |
| JP2008057756A (en) * | 2006-09-04 | 2008-03-13 | Kayaba Ind Co Ltd | Oil seal for reciprocating |
| US7753377B2 (en) * | 2007-01-29 | 2010-07-13 | Freudenberg-Nok General Partnership | Shaft seal having shaft offset compensating capability |
| DE102013114662A1 (en) | 2013-12-20 | 2015-06-25 | Carl Freudenberg Kg | A shaft seal assembly |
| US9714710B2 (en) | 2014-02-04 | 2017-07-25 | Freudenberg-Nok General Partnership | Energy saving self-contact seal with pushing bead |
| US9695937B2 (en) | 2014-02-04 | 2017-07-04 | Freudenberg-Nok General Partnership | Energy saving seal with vacuum induced counter-balance and rocking feature |
| US9759330B2 (en) | 2014-02-04 | 2017-09-12 | Freudenberg-Nok General Partnership | Energy saving seal with rocking dust lip |
| EP3865739B1 (en) * | 2014-03-21 | 2024-04-24 | Saint-Gobain Performance Plastics Corporation | Rotary shaft seal |
| US10393268B2 (en) | 2014-03-27 | 2019-08-27 | Saint-Gobain Performance Plastics Corporation | Rotary shaft housing and seal |
| CN109073086B (en) * | 2016-05-10 | 2020-01-14 | Nok株式会社 | Dust-proof sealing part |
| US11193589B2 (en) * | 2017-03-29 | 2021-12-07 | Nok Corporation | Sealing device |
| US11255437B2 (en) | 2017-04-12 | 2022-02-22 | Nok Corporation | Sealing device |
| WO2018212218A1 (en) * | 2017-05-18 | 2018-11-22 | Nok株式会社 | Method for manufacturing sealing device, and sealing device |
| US10527173B2 (en) * | 2017-08-15 | 2020-01-07 | Aktiebolaget Skf | Resilient shaft seal |
| DE102020200281A1 (en) | 2020-01-11 | 2021-07-15 | Robert Bosch Gesellschaft mit beschränkter Haftung | Radial shaft seal |
| US20220216763A1 (en) * | 2021-01-05 | 2022-07-07 | Fairway Electronic Co., Ltd. | Rotating Machine |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE972155C (en) * | 1944-06-13 | 1959-05-27 | Kupfer Asbest Co | Ready-to-install shaft seal |
| US2998987A (en) * | 1958-01-30 | 1961-09-05 | Koppers Co Inc | Teflon lip seal |
| FR1258972A (en) * | 1960-03-10 | 1961-04-21 | Blackhawk Mfg Company | Fluid tight seal |
| US3254898A (en) * | 1963-06-21 | 1966-06-07 | Trw Inc | Multiple lip seal |
| US3394939A (en) * | 1966-12-08 | 1968-07-30 | Johns Manville | Fluid pressure actuable seal |
| US3495843A (en) * | 1967-04-17 | 1970-02-17 | Chicago Rawhide Mfg Co | Pressure seal with antiextrusion means |
| DE2442338C2 (en) * | 1974-09-04 | 1982-07-01 | Alfred Teves Gmbh, 6000 Frankfurt | Sealing ring for sealing a pin in a pin bushing |
| FR2390647A2 (en) * | 1977-05-11 | 1978-12-08 | Paulstra Sa | IMPROVEMENTS TO GASKETS OR SIMILAR GASKETS |
| SE420757B (en) * | 1978-02-08 | 1981-10-26 | Stefa Industri Ab | SHUTTER FOR A FORWARD AND RETURNING BODY |
-
1980
- 1980-02-07 US US06/119,631 patent/US4300778A/en not_active Expired - Lifetime
-
1981
- 1981-02-04 MX MX185842A patent/MX152400A/en unknown
- 1981-02-06 CA CA000370373A patent/CA1150745A/en not_active Expired
- 1981-02-06 BR BR8100747A patent/BR8100747A/en not_active IP Right Cessation
- 1981-02-06 JP JP1678581A patent/JPS56150671A/en active Granted
- 1981-02-07 EP EP81100877A patent/EP0033964B1/en not_active Expired
- 1981-02-07 DE DE8181100877T patent/DE3160066D1/en not_active Expired
- 1981-02-07 AT AT81100877T patent/ATE2570T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0033964B1 (en) | 1983-02-16 |
| BR8100747A (en) | 1981-08-18 |
| ATE2570T1 (en) | 1983-03-15 |
| JPS6153582B2 (en) | 1986-11-18 |
| MX152400A (en) | 1985-07-10 |
| DE3160066D1 (en) | 1983-03-24 |
| EP0033964A3 (en) | 1981-08-26 |
| JPS56150671A (en) | 1981-11-21 |
| EP0033964A2 (en) | 1981-08-19 |
| US4300778A (en) | 1981-11-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |